Well you have some talent. I do have some pointers regarding execution that would really improve your work.

First you need wider tonal values. That is, there should be some really black areas, stronger highlights and you should see the gradation between the two, especially on the guitar face, (which I would imagine is a lacquer finish). The shadows should be slightly feathered as they fade to the back and not so crisp, they should also carryon up the wall (or whatever background it's resting on). Given the lighting direction the shadow on the strings appear higher than they should be. The shadow from foreground objects should be present on background objects, again this could be a tonal value issue. This will give you more depth.The frets should should be all parallel.When shading and not using a blending stick, you should make sure to shade the strokes in the same direction.

well yeah you`re right and thanks for all your pointers.. but still i consider this piece beautiful because of the fact that i`ve never taken any drawing classes (: and at the time i didn`t had any different types of pencils, i just used 2h, that`s why i couldnt do any high contrasts.. but know i know and ive got more supplies to do my work

very nice work here ^^ i could sugest a shade on the guitar freet where the headphones lean into it. I really love al the detail on it whatsoever, you even got all the freet tabs shaded *thumbs up* (excuse me if the terminology is wrong XD i used to play acustic guitar but that was two years ago)

aww, thanks so much, really! i LOVE guitars too! lol.. and it's a Fender, a Billy Corgan Stratocaster i only changed it a bit x)& of course i'm a BIG fan of music...So i'll do more drawings in that theme.i hope you keep in touch!